Hi @Anonymous ,
Thanks for your post! The credentials of the guest accounts in the AAD tenant are not synced into the Azure AD DS domain, as the guest accounts' password hashes are not in the same tenant. Please find this documented here: https://learn.microsoft.com/en-us/azure/active-directory-domain-services/faqs#can-guest-users-be-invited-to-my-directory-use-azure-ad-domain-services-
If the authentication requests are sent to Azure AD DS for authentication in the logic, it won't work since AAD DS is not aware of these guests password hashes.
Let me know if this helps. I'm happy to share feedback with the product team for improving this experience if you'd like to share more details about your scenario. Alternatively, if you would like to leave product feedback yourself, you can do so here: https://feedback.azure.com/
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